Secondary Interposer Die Stack Packaging for Compact Multi-Die Routing
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Solution Overview
Problem
Conventional semiconductor packaging processes face challenges in integrating multiple dies within a single package due to increased physical space, signal integrity, thermal dissipation, and complex interconnections, leading to impractical lateral dimensions and space constraints in system-in-package (SiP) applications.
Innovation Solution
The implementation of secondary interposers and input-and-output extenders in die stack packages, allowing for a cascading arrangement of dies with vertical interconnections, reducing the lateral dimension while maintaining electrical connectivity and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional packaging processes are used to integrate multiple dies, then electrical connectivity between dies is achieved, but the lateral dimensions of the package become impractically large
Solution Approach 1:
The patent transitions from a planar arrangement of dies to a three-dimensional stacked configuration. Multiple dies are arranged in vertical layers on top of each other, utilizing the vertical dimension (z-axis) rather than only the horizontal plane. This dimensional change allows integration of multiple dies while dramatically reducing the lateral footprint of the package.
Solution Approach 2:
The patent implements a nested structure where multiple dies are stacked vertically, with each die positioned on top of the previous one. The interposer structures are nested between die layers, and the entire stack is encapsulated within a protective housing. This nesting arrangement maximizes space utilization and minimizes the overall package lateral dimensions.
2Adaptability or versatility
If more dies are integrated into a single package, then functionality and performance are improved, but thermal dissipation becomes more difficult
Solution Approach 1:
The patent introduces interposer structures as intermediary components between stacked dies. These interposers serve as thermal mediators, providing thermal pathways and heat dissipation interfaces between the densely packed dies and the external environment. The interposers facilitate thermal management by distributing heat from multiple dies across larger surface areas.
Solution Approach 2:
The patent implements localized thermal management solutions by incorporating thermal vias, heat spreaders, and thermally conductive materials in specific regions where heat generation is highest. Different portions of the package receive tailored thermal management approaches based on the local heat density and functional requirements of individual dies.
3Adaptability or versatility
If more dies are integrated into a single package, then performance is improved, but signal integrity becomes more challenging to maintain
Solution Approach 1:
The interposer structures serve as signal routing intermediaries between stacked dies. They provide controlled impedance signal paths, isolation layers, and routing channels that maintain signal integrity across multiple die interfaces. The interposers act as buffer zones that prevent signal interference and maintain electrical characteristics.
Solution Approach 2:
The patent divides the signal routing function into separate segments handled by different layers and interposers. Each die interface has dedicated signal paths and isolation structures, preventing signal crosstalk and interference. This segmentation of signal routes maintains integrity even as the number of integrated dies increases.
4Reliability
If conventional packaging processes are used, then dies are protected from environmental factors, but the complexity of interconnections increases
Solution Approach 1:
The patent combines multiple functions into integrated structures: the interposers simultaneously provide electrical interconnection, mechanical support, and thermal management; the encapsulation provides both environmental protection and structural integrity; the stacking arrangement combines space efficiency with simplified external interfacing. This merging reduces overall system complexity despite increased integration density.
Solution Approach 2:
The interposer structures serve multiple functions simultaneously: they provide electrical interconnection between dies, act as mechanical support structures, facilitate thermal dissipation, and enable signal routing. This multi-functionality reduces the number of separate components needed and simplifies the overall package architecture.
Data Source
AI summary
Systems, devices, and methods for high die stack packages with secondary interposers are provided herein. A die stack package can include a first substrate, a first die stack carried by the first substrate, a second die stack carried by the first substrate, a second substrate carried by the first die stack and the second die stack, a third die stack carried by the second substrate, a fourth die stack carried by the second substrate, and one or more vertical wires electrically coupling the first substrate and the second substrate. Each of the first, second, third, and fourth die stacks can include a plurality of dies stacked in a cascading arrangement. In some embodiments, the first and second die stacks are each electrically coupled to the first substrate. In some embodiments, the first and second die stacks are each electrically coupled to the second substrate.